M3 Metric Thread Dimensions and Pitch
Below are the key dimensions for M3 metric threads: pitch, tap drill and clearance drill according to ISO 724:2023.
M3 Coarse (standard)
Step onto our M3 Metric Thread Page, your comprehensive reference for swift metrics on M3 metric threads. We've compiled a broad library of data for all the typical metric threads utilised in your parts, focusing on essential measurements like thread pitch, tap drill, and clearance drill. It's a comprehensive solution for engineers, machinists, and hobbyists seeking dependable and accurate information.
M3 Coarse Pitch Dimensions
M3 Fine Pitch Dimensions
All dimensions stated in are mm (millimetre)
ISO Metric Thread profile
The Major Diameter is the largest diameter on the thread and is measured from the thread crest to crest (peak of the thread).
This is the distance (mm) from one thread to the next, this can be measured from tip to tip or groove to groove. Pitch can also be defined as TPI, which stands for threads per inch.
Minor Diameter is the smallest diameter on the thread and is measured from the thread root to root (Bottom of the thread).
The angle between the thread faces. 60 degrees in the example above.
The thread will assemble when rotated clockwise. "righty tighty lefty loosely"
The thread will assemble when rotated counter-clockwise.